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bicycle rickshaw a type of transportation originating in Asia, having three wheels and two passenger seats, and powered by a person pedaling; pedicab; cycle rickshaw.
biennial in botany, having a life cycle of two years. [2/5 definitions]
biorhythm an inherent rhythm or cycle in a biological function or process. [1/2 definitions]
Circadian rhythm the approximately 24-hour cycle apparent in plants and animals that regulates hormone production, cell regeneration, sleeping and feeding patterns, and the like. [1/2 definitions]
circle a process or series of events that ends where it started, esp. such a process or series that repeats itself; cycle. [1/8 definitions]
compression the reduction in volume and increase in pressure of air or air mixed with fuel in the cylinder of an internal combustion engine prior to ignition, or the engine cycle in which this process takes place. [1/3 definitions]
cyclic pertaining to, forming, or recurring in a cycle. [1/2 definitions]
cyclical pertaining to, forming, or recurring in a cycle. [1/3 definitions]
cyclo- cycle; circle; ring. [1/2 definitions]
estrous cycle the cycle of chemical and physiological changes in female mammals from one period of estrus and ovulation to the next.
hertz a unit of frequency equal to one cycle per second. (abbr.: Hz)
hydroid any hydrozoan in the asexual polyp form of its life cycle. [1/2 definitions]
Hz abbreviation of "hertz," a unit of frequency equal to one cycle per second.
melatonin a hormone secreted by the pineal gland that is important in regulating the body's response to biological rhythms such as the light-dark cycle.
menarche the first menstrual cycle of a girl.
new beginning or repeating as part of a cycle. [1/9 definitions]
nitrogen cycle the continuous natural cycle by which nitrogen passes from air to soil to organisms and back to air.
open chain in chemistry, a linear series of covalent atoms not joined at the ends into a cycle, such as an aliphatic compound.
pedicab a type of transportation originating in Asia, having three wheels and two passenger seats, and powered by a person pedaling; cycle rickshaw; bicycle rickshaw.
perennial in botany, having a life cycle of more than two years. [1/4 definitions]
Persephone in Greek mythology, the daughter of Demeter and Zeus, carried off by Hades to the underworld and thereafter permitted to spend only half the year back in the world. The myth presents this cycle of loss and return as the origin of the seasons.